Can coating roller

ABSTRACT

Readily recoverable can coating roller with metal core; preformed cover of cardboard tube having outer layer of suitable elastomer, such as urethane, cast thereon while on a mandrel in a mold, finish ground and removed from mandrel; and mechanical means for securing preformed cover to core, comprising peripherally disposed lugs at one end of core interengaged by corresponding notches in one end of cardboard tube, and a notch in other end of the tube engaged by clamp removably mounted on core.

United States Patent Brown Nov. 13, 1973 CAN COATING ROLLER 563,572 7/1896 Day 29/132 ux 2,616,633 11/1952 Reynolds 29/129 UX [75] lnvenw BTW, Aflmgw Helghts 3,601,875 8/1971 Skelton 29 129 [73] Assignee: Samuel Bingham Comapny, 'y Examiner-Alfred Guest F kli P k [IL Att0mey.lames A. Davis et al.

[22] Filed: Aug. 11, 1972 [57] ABSTRACT [21] ApPl- 279,951 Readily recoverable can coating roller with metal core; preformed cover of cardboard tube having outer 52 us. 01. 29/129, 29/130 layer of Suitable elastomer, Such as urethane, Cast 51 1m. (:1 B21b 31/08 thereon while on a mandrel in a mold, finish ground [58] Field of Search 29/129, 130, 132, and removed from mandrel; and mechanical means 29 R for securing preformed cover to core, comprising peripherally disposed lugs at one end of core interen- 5 References Cited gaged by corresponding notches in one end of card- UNITED STATES PATENTS board tube, and a notch in other end of the tube engaged by clamp removably mounted on core. 949,564 2/1910 Bruegel 29/129 X 2,066,755 1/1937 Wilkie 29/129 2,715,879 8/1953 Sawyer..... 29/129 x 2 Claims, 3 Drawing Figures 3,063,711 11/1962 Springer r 29/129 X 271,567 1/1883 Bardwell 29/129 X CAN COATING ROLLER BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates generally to printers rollers, and more particularly to can coating rollers.

2. Description of the Prior Art In the repair of printers rollers, a large portion of the cost comes from the expense and time required for transporting the rollers between manufacturing or repair centers and use locations, the major part of which is due to the weight of the metal core. And in most fields of use of such rollers, the user finds it necessary to keep a duplicate roller on hand for those periods during which one roller is being repaired.

Efforts have been made to reduce the cost of repairing such rollers by providing a preformed outer covering for the metal core but, as in the case of U. S. Pat. No. 3,184,355 which uses a tubular sleeve of extruded rubber vulcanized to a liner of stretched knitted cotton fabric subsequently adhered throughout its inner surface to the core by an adhesive, it is necessary if replacement of the covering is to be accomplished at the use location to have equipment there available for cutting the old covering off of the metal core.

SUMMARY OF THE INVENTION This invention eliminates the necessity of cutting a worn or damaged covering from the metal core of a printing roller by providing a readily replaceable preformed outer covering which is mechanically secured to the core, comprising an outer layer of an appropriate elastomer, such as urethane, cast onto a thin rigid cylindrical tube of cardboard, or other cheap material. This outer covering is formed by placing the cardboard tube on a mandrel, casting the outer elastomer cover thereon in a mold, finish grinding the core while on the mandrel, and then removing it therefrom. The mechanical means for removable securing the preformed cover to the core comprises peripherally disposed lugs on one end of the core interengaged by corresponding notches in one end of the cardboard tube, and a notch in the other end of the tube engaged by a clamp removably secured to the core.

Thus, whenever it is desired to repair a worn roller, it is necessary only to loosen the clamp, slide the outer covering longitudinally off the core, slide a new covering onto the core and secure the same in place by means of the clamp, all of which may be easily accomplished right at the use location without any special equipment.

Not only is there no necessity of transporting the heavy metal core to some other location for repair, it also is unnecessary for the user to carry an extra roller on hand. All he needs to do is maintain a replacement outer covering in stock, which covering is much less expensive than the metal core and can be stored alone a great deal easier than a complete roller.

IN THE DRAWINGS FIG. 1 is an end view of a printers roller embodying the features of this invention;

FIG. 2 is a longitudinal section taken substantially on the line 2-2 of FIG. 1; and

FIG. 3 is an end view, as seen from the right side of FIG. 2.

DESCRIPTION OF PREFERRED EMBODIMENT Referring more particularly to the drawings, reference numeral 11 indicates. in general a can coating printers roller which comprises a metal core 12 having suitable journals 13 and, at one end, a plurality of peripherally spaced lugs 14 formed integrally therewith or secured to the outer cylindrical surface thereof in any suitable manner.

Slidably mounted on the core 12 is a preformed outer covering comprising a cardboard tube 15 with an inner diameter only slightly greater than the outer diameter of the core 12 and having an outer layer 16 of a suitable elastomer, such as urethane which is cast thereon while the tube is on a mandrel in a mold. This casting operation is the same as that heretofore employed in mounting such an outer layer directly on the metal core, and the resulting elastomer layer is finish ground and trimmed in well known manner before the cover is removed from the supporting mandrel.

Formed in one end of the cardboard tube 15 are a plurality of peripherally spaced notches 17 so located and shaped as to slide into embracing engagement with the lugs 14 when the outer cover is slid lengthwise onto the core 12 to its operative position of FIGS. 1 and 2. At its other end, the cardboard tube 15 is provided with a similar notch 18 (FIGS. 2 and 3) to embracingly receive the inner end of a clamping means in the form of a right-angled dog 19. The other end of the dog 19 is apertured to receive a hollow set screw 21 which constitutes part of the clamping means for removably retaining the preformed outer cover on the core. It will be understood that the notches l7 and lugs 14 prevent relative rotation of the core 12 and tube 15 and limit longitudinal movement of the latter relative to the core to the left in FIG. 2 from its therein illustrated operative position, and that the notch 18 and clamping means 19,21 normally function in similar manner at the other end, these several parts comprising mechanical means for removably securing the preformed outer cover to the core.

The notches 17 and 18 may be cut in the tube 15 after casting of the layer 16 thereon if desired, but it is preferred that they be cut in the tube before it is mounted on the casting mandrel so that they may be employed with means on the mandrel similar to the members 14 and 19,21 to removably secure the tube thereon. The simple mechanical means herein disclosed for removably securing the preformed outer cover 15,16 to the core 12 enables replacement of a worn or otherwise damaged cover right at the use location without any special equipment and with a minimum of effort. It is particularly advantageous with rollers running under light service conditions, such as can coating rollers, wherein adhesion of the outer cover over the entire peripheral surface of the core is not necessary. And it will be appreciated that the use of cardboard for the tube 15 minimizes the cost of the roller while providing the desired thin and rigid characteristics therefor.

It is thought that the invention and many of its attendant advantages will be understood from the foregoing description, and it will be apparent that various changes may be made in the form, construction and arrangement of the parts without departing from the spirit and scope of the invention or sacrificing all of its between, wherein said mechanical means comprises peripherally spaced lubs at one end of said core, notches in one end of said cardboard tube engaging said lugs, and clamping means secured to the other end of said core in engagement with the other end of said tube. a

2. A can coating roller according to claim 1, wherein said cardboard tube is notched at said other end to receive said clamping means. 

1. A can coating roller, comprising a metal core; a preformed outer cover slidable longitudinally onto said core, comprising a cardboard tube having an outerlayer of a suitable elastomer cast thereon while on a mandrel in a mold, and finish ground before removal from the mandrel; and mechanical means removably securing said preformed outer cover to said core and preventing relative longitudinal and rotational movements therebetween, wherein said mechanical means comprises peripherally spaced lubs at one end of said core, notches in one end of said cardboard tube engaging said lugs, and clamping means secured to the other end of said core in engagement with the other end of said tube.
 2. A can coating roller according to claim 1, wherein said cardboard tube is notched at said other end to receive said clamping means. 